Browsing by Author "Younger, A."

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    Crack propagation in light alloys Ministry of Aviation contract no. PD/28/07
    (College of Aeronautics, 1965-11) Younger, A.
    The revised approach to the measurement of the rate of crack propagation in light alloys has entailed the development of new experimental techniques, in particular the development of a multi-channel interval timer. The design of this instrument and descriptions of the new techniques are reported here together with the results of some preliminary evaluation tests.
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    Experimental techniques used in the high temperature heat-treatment of some tungsten-thoria alloys
    (College of Aeronautics, 1964-12) Younger, A.
    The high temperature apparatus developed in the Department of Materials for the torsional creep testing of graphite at temperatures up to 3000 oC has been utilised to heat-treat tungsten-thoria alloys at temperatures up to 2500 oC. Modifications to the torsional loading system have enabled some of these heat-treatments to be carried out under an applied stress.
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    Push-pull fatigue properties of wires in an iridium: 5% tungsten alloy
    (College of Aeronautics, 1965-02) Younger, A.; Whitbread, R. C.
    Introduction. The Materials Department at Cranfield was approached by the Platinum Metals Division of the International Nickel Co. with a view to carrying out a preliminary survey of the fatigue properties of an iridium-5% tungsten alloy. This alloy in drawn wire form is intended for future use in springs subjected to elevated temperatures. For this reason it was decided to investigate both the tensile and the torsional fatigue properties of these wires at room and elevated temperature. This report covers the tensile room temperature properties; subsequent reports will deal with the torsional and the high temperature properties.
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    The replica strain gauge technique
    (College of Aeronautics, 19) Castle, W.; Younger, A.; Sollars, A. R.
    Surface deterioration and dimensional stability tests have been carried out on the low melting point replication alloy described in the first report. A range of alloys for the replication of surfaces at temperatures in the range 120 - 150°C has been prepared and evaluated. Preliminary studies of a cold pressing technique using fully annealed commercial purity aluminium as the replication material have shown that the technique has considerable promise for application over a wide range of temperatures.
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    Room temperature torsional fatigue properties of an iridium: 5% tungsten alloy
    (College of Aeronautics, 1965-02) Younger, A.; Whitbread, R. C.
    Introduction Fine wires of an iridium-5% tungsten alloy have been developed as a potential material for use in springs operating at high temperatures. Their suitability for such applications will to a considerable extent depend on satisfactory fatigue properties. The Materials Department of The College of Aeronautics was approached with a view to determining these torsional fatigue properties. This report covers preliminary work into this problem, namely the torsional fatigue behaviour of 0.020 ins. diameter wires at room temperature.
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    Stress redistribution due to creep in nimonic 90 ministry of aviation contract no. PD/28/021 report for the period January 1964 - June 1965: part 1
    (College of Aeronautics, 1965-09) Younger, A.; Clifton, T. E.
    The period covered by this report has been devoted to the design, construction development and calibration of a special apparatus to simulate the stress redistribution conditions occurring during the creep of a cooled turbine blade. The experimental assembly consists of two creep machines, each operating at a different temperature, so controlled that a load is shared between them. maintaining equal creep strains (and in consequence equal creep rates) in each specimen. The stress in each specimen and the creep strain of the pair are automatically measured and recorded by a specially developed unit. Some preliminary results on an aluminium alloy are presented.